Method of mining



Feb. 3, 1942. Y. KIDA METHOD 'oF MINING Filed Sept. 21, 1939 Patented Feb. 3, 1942 ICE" METHOD OF MINING Yasuzo Kida, TokyoQJapan Application September 21, 1939, Serial No. 295,96 In Japan September 29,1938

2 Claims.

This invention relates to a method of mining, and has for itsobject to work the deposit so as to extract the mineral completely in most economical manner. I

'In the heretofore practised method of mining, it is usually necessary to sacrifice a considerable proportion of the mineral which is left in within the deposit 5. Then, if necessary, a ceiling I2 and lining sidewalls l3 are provided to prevent the fall of the roof and the side walls.

Then the deposit within said framework is worked so as to extract the mineral completely. When.

, desired the above-mentioned method may be rethe shape of pillars to support the surface or overlying strata to avoid injury to valuable structures or to prevent the fall of the roof or side walls. Consequently, such method can not be recognized as an ideal method froman economical standpoint of view. This invention aims to work the ore deposit so as to extract the mineral completely, and according to this invention the method consists in sinking shafts in the ore deposit at suitable ir 1tervals,erectingv pillars or timber supports in said shafts, mounting horizontal beams connecting said pillars so as to thus erect a framework, and if necessary making a ceiling, and then extracting the min eral within'said framework completely.

In the accompanying drawing:

Figure 1 is a vertical sectional view illustratingthe method of mining" according to this invention, andj 3 v I Figure 2 shows in detail a portion of Figure 1 in an enlarged scale.

In carrying out theinvention, from the surface I a mainshaft 2 is sunk, or from the inclined surface 3 a main haulage road 4 is provided. Throughsaid shaft 2 and road 4, shafts 6 are sunk in the deposit in suitable depth and at suitable intervals. Providing foundations '1 if necessary, there are erected pillars or timber supports 8 in said shafts 6, and drifts 9 at suitable positions. Through said drifts 9 horizontal beams ID are mounted to connect supports 8 and, extracting the mineral in said shafts, 6 and the drifts 9, there is erected a framework II measuring the hardness of the ore deposit and peated throughout the whole area of the mine was to extra'ctthe mineral completely.

The pillars or timber supports 8 in the shaft 2 or 6 may convenientlybe utilized for the guide posts for. the elevators, and the horizontal beams It can conveniently'be used as rails for conveyors.

I From the foregoing, it will be seen that, according to the method of this, invention, by

' determining the depth and intervals of'the shafts the working of the'deposit can be safely proceeded without any danger of thefall of the roof or side walls, and that the mineral can be ex tracted completely throughout the mine, so that the present invention possesses a technical progress from an economical standpoint of view.

What I claim is: l 1

1. A. method of mining comprising sinking v shafts in the ore deposit at suitable intervals,

- erecting pillars or'timber supports in said shafts,

- shafts in the ore deposit at suitable intervals,

erecting'pillars or timber supportsin said shafts, mounting horizontal beams connecting said pillars so as to thus erect a framework, providing a ceiling to prevent thefall of the roof, and then extracting the mineral within said framework completely.

- YASUZO KIDA. 

